Many steel structure cemented carbide sintered blanks can be subjected to general cutting after annealing. After quenching and tempering, they have a hardness similar to that of cermet cemented carbide and outstanding wear resistance. They can also be welded and forged, and It has the characteristics of abrasion resistance and oxidation resistance.
Analysis of the application of cemented carbide in drawing molds: Although this type of material is expensive and difficult to mold, it can significantly increase the service life of the mold after use, and it has a good technical and economic effect in mass production. Therefore, to promote it on a larger scale and at a deeper level has very important implications for the mold industry. Next, Shenzhen Jinwu Technology will introduce us to the application analysis of cemented carbide drawing dies.
(1) Problems in the original production; if the mold data is 08A1, the material thickness is 0.8mm, and the production batch is large batch. Two deep drawing is required to form the part. In the original mold, the material of the concave mold is Crl2, and the equipment used is a general double-action press. During production, after the mold is used for a period of time, the appearance of the part will show significant scratch marks, which severely affects the appearance quality. The investigation found that after the first drawing process, there were a few scratches on the surface of the semi-finished product, and the scratches and scratches increased significantly after the second drawing, and the surface of the die was severely worn and often adhered to the workpiece. data.
The factory has tried to improve the precision of mold manufacturing, reduce the surface roughness value, and even polish and chrome plate, but it still cannot fundamentally solve the problems of product surface strain and short mold life.
(2) Process analysis; after analysis, it can be seen that the original mold structure, the structural parameters of the stretching mold operation part, and the smoothing method in the stretching process are fundamentally reasonable, and the scratches and scratches on the part are mainly between the mold and the surface of the processed blank The touch situation of the conflicting side is related. On the one hand, a lot of pressure will occur when the blank touches the surface of the mold during the drawing process. At this moment, the smooth area of certain conflicts and gaps cannot be supplemented by the smoothing agent, which will aggravate the conflict state there; on the other hand, Then 08A1 is a soft material, if the mold hardness is low, it will aggravate the occurrence of deformation heat. Although the heat treatment hardness of Cr12 is already high, it is still insufficient for the large-scale continuous drawing in this example.
The above reasons have caused the temperature of the conflict surface to rise sharply after the mold has been used for a period of time. At high temperatures, local metal welding will conflict and bond, causing the semi-finished product to first show scratches and fine scratches. At this moment, if the mold is not repaired in time, the scratches and minor scratches that occurred in the previous process will inevitably increase the wear of the mold in the next process, which will increase the drawing force, the tensile stress of the side wall of the part, and the conflict resistance, causing conflicts. The surface temperature further rises, and then again causes metal deposition, which aggravates the occurrence of conflict bonding, leading to a vicious circle, the more severe the deposition, and the more obvious scratches.
Based on the above analysis of the application of cemented carbide in deep drawing dies, taking into account that the steel-bonded cemented carbide JW08 has high hardness (quenching hardness up to 69-73HRC), high wear resistance, small heat treatment deformation and outstanding machining It can satisfy the application and processing requirements of deep drawing in this example, so we changed the die material Cr12 to steel-bonded cemented carbide JW08.
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